Coreen Martinez, MS, RN, NP-C, OCN
NPI 1821639923 · Gerontology Nurse Practitioner · Houston, TX
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Coreen Martinez, MS, RN, NP-C, OCN is a Gerontology Nurse Practitioner provider in Houston, TX (NPI 1821639923).
Provider details
- NPI number
- 1821639923
- Entity type
- Individual
- Primary specialty
- Gerontology Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- MS, RN, NP-C, OCN
- Sex
- Female
- Sole proprietor
- No
- License
- AP142239 (TX)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
6 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
210 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 196 | $78 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 14 | $73 |
Typical Medicare-allowed amounts for these services range $73–$78 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Letrozole | 186 | 61 |
| Anastrozole | 127 | 51 |
| Exemestane | 103 | 33 |
| Tamoxifen Citrate | 71 | 26 |
| Ondansetron Hcl | 34 | 14 |
| Prochlorperazine Maleate | 32 | 15 |
| Abemaciclibbrand: Verzenio | 23 | — |
| Gabapentin | 22 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$279 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-10-01
- Last updated
- 2019-10-01
Frequently asked questions
- What is Coreen Martinez's NPI number?
- Coreen Martinez's National Provider Identifier (NPI) is 1821639923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Coreen Martinez's specialty?
- Coreen Martinez is listed in the NPPES registry with a primary specialty of Gerontology Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Coreen Martinez located?
- Coreen Martinez's practice location on file with NPPES is 1515 Holcombe Blvd, Houston, TX 77030-4000.
- What is Coreen Martinez's phone number?
- The practice phone number listed in the NPPES registry for Coreen Martinez is (713) 792-6161.
- Does Coreen Martinez accept Medicare?
- Coreen Martinez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Coreen Martinez's NPI active?
- Yes — Coreen Martinez's NPI (1821639923) is active in the NPPES registry as of the last update on 2019-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.